Mass transfer of chemical absorption of CO2/N2 mixed gas in a microchannel

Abstract

In the chemical industry, the gas phase is not always pure gas generally. The mass transfer (MT) of mixed gas in a microchannel was investigated by using organic amine aqueous solution to absorb CO2/N2 mixed gas. MT in the bubble formation stage was calculated, and the influence of operating conditions on it was investigated. When the gas contacts the liquid, the CO2 in the bubble is continuously absorbed. Combined with the reduction of bubble volume, the instantaneous MT driving force of the bubble along the microchannel is calculated. On this basis, the MT coefficient of the mixed gas is obtained. The results show that after mixed gas in a certain concentration enters the microchannel, the instantaneous MT driving force and instantaneous MT coefficient are constantly decreased during the bubble moves along the microchannel.